Automatic switching system



Nov. 22, 1932. R, FULLER 1,888,856

AUTOMATIC swxwcnme SYSTEM Filed Nov. :50, 1929 Inventor: R0 er A. Puller,

His AUb orneg.

Patented Nov. 2 2, 1932 PATENT oFFrcE Booms. ILLER, or PHILADELPHIA, PENNSYLVANIA, AssreNon 'ro GENERAL 1 ELECTRIC COMPANY, A oonronnrrou on NEW YORK- AUTQMATIG SWITCHING SYSTEM Application filed November 30, 1929. Serial No. 410,827.

of the switches 4 and 5. The cams 8 and 9 i invention relates to automatic switchingsystems and particularly to systems for controlling the connections between a plurality of sources of current and a load circuit so that the load circuit is connected to an energized source when either or both of these sources are energized, and one object of my invent on is to provide a simplified control arrangement for accomplishing this result. 'In accordance with my invention Iprovi'deaswitch betweenfeach source and the load circuit, a reversible motor whichis arranged tojclos'e one of the switches and to open theother switch when the motor arma- .1 ture is rotated 'in one direction and to close I said other switch andto open said one of said switches when the motor armature is rotated in the opposite direction, and means responsive to the voltages of the sources for selectively controlling the direction of rotation of the motor armature.

My invention will be better understood "from the following description when taken in connection with the accompanying drawl ing and its scope will be pointed out in the appended claims.

; Referring to the-accompanying drawing which is a diagram of an automatic switchirig system for "selectively controlling the connectionsbetween ailoaa circuit, a preferred source of currentfor the load circuit and an emergency source of current which is tobe connected'to the load circuit when the "preferred source is deenergized, 1 and s 2 represent respectively the preferred and emergency sources and 3 represents the load circuit. The sources 1 and 2, which are shown as single phase supply circuits, are arranged to be connected to the load circuit 3 by suitable switches 4 and 5 respectively.

For eifecting the selective operation of the switches 4 and 5 a reversible motor 6 is provided whichdrives a suitable cam shaft 7 to which are fixed two operating cams 8 and 9 for respectively controlling the operation are identical in shape but are reversely arranged on the shaft'7 and so shaped that when, the shaft is in the position shown in the drawing both of the switches 4 and 5 are open. When, however, the shaft 7 is rotated in a counter-clockwise direction from the position shown in the drawing, the. cam 8 is arranged to effect the closing of the switch 4 and the cam 9 is arranged to maintain the switch 5 in its open position. When theshaft 7 is rotated in a clockwise direction from the position shown in the drawing, the cam 9 is arranged toelfect the closing of the switch 5 and the cam 8 is arranged to maintain the switch 4 in its open position. It will be seen that with the arrangement shown in the drawing only one switch can be closed at a time and, therefore, the load circuit 3 can: not be simultaneously connected to both sources of current.

In order to effect the selective operation of the motor 6 so that the switch 4. is closed whenever the preferred source Isis energized and so that the switch 5 is closed whenever the preferred source 1 is deenergized and the emergency source 2 is energized, I provide a potential relay 10 which is *connected across the secondary of a potential transformer 11 theprimary of which is connected across the preferred source 1. When the preferred source 1 is energized the relay'lO is arranged to connect the armature winding 12 and the field winding 13 of the motor 6 across the secondary of the potential transformer 11 so that the shaft 7 is rotated in a counterclockadd across thegenier'gency source 2. t 1 t y Bar e e rg is complete circuit for the arma- H-fand 1 closing swims,- if itis open. Q It he observedthat the 1rxiotential relay e513 cineflect theoperation of t "inotor 6 the preferred source; 1 is ldeegegized emergency source 2 is ener'gi the motor Q after "the shait has isprovidedwith I smtahlehnut 18 v' in gthe IPDQQ' ClI'ClIltiIlId J 1- a motor cir it m L Initiate ,,n,'w se tum; Qtiss%m shswn w -eihnft'i' iinthemtion shgwn which of the poteni. who it imm a Mane-3 M i he P59- m foreeertaln 1 jam m im be m v ig itnleeymitablemxsiio delaying closing of the contacts 22hr a certain 9f the oi the relay it Y s mi -fl ow ng the steam omes-e is delayed by .li t 23;,:The,B1 1ergization of g a eflc e hecpenm qfth con. 1 154;? ;ieley contyctaigz cf c me e-1 of'flioamototo'is from one sec of the transformer 11 4 'rflie contacts% of the nel'ayifl, field of'the moter.j.,6,"contacts 21 of r 139E110; armature 12 oithe mo- Bifihtit 15 ogfthe shaft if, contacts '3? m oi thhgrelfiy lfi toth'eother secondary terlfiinircfifil transformer 11'. The counter- I of thehaft 7- efie'cts; the i switch other the preferred swe t e fotlte 1W1 circuit a, shaft T17 sis-rotated for enough to mlete the closing operttion of'the switch limit' switeh lfi ofiensthe traced a r 17 the primary of which.

- e, theifieldwindinfg s of p W trtnsformerfl so that theshoft '7 1s hila'elockwise direction tdifct 4,it it mom r.

ro ated to a pre the potentialrelay 10 so thguhis relay H its contacts 20, 21 and-22 and closes' its confl-cts 24:258111 26. The n of the-com in New Infl w e:

of t e yoten'tial re ay 16'acros's t e secon "of the relay-1 hecoines..energiaedmd 1 1 3' t closes'ita eontacts.2 8;and 29 and-closes after. a predetermined time its time delay contacts 30. Any seitible means, examples of which are wellnknqwnin theart, may be provided for delaying the .closing of the contacts 30. As shownin the drawing,,the delayed ing ofjthe contacts 30,ifs f'efiectd,hy n pot 311' 16 has energized for i: certain length sit t m h tw s ose meo ple Y energiz circuit tor the 6 so the motor; ar a tnre rotates 5a fish h energizing We 1 s tr sec 3 termm' 1 of the 011 :1 I V l t11roligl i contactsfwl 16,635

'fifiential transformer 2 9 t the g 159111 win 113 of'the ih'btor 5, a f? e h i es 16 contacts 26 tourism 1:; e cdw ins 1o: meme, limit My .termimil ofthelrmsfomi it in the bpP-z Versol ofrcurrent through the armature wind ing 12 with respect tothe current thron the field win i g .1 u es me er Q rotate inge 'eloekwise'dimetion 'l'his J rotatlon'of the shaft efieets the 1 m g of the switch 4 'so as iq di pnnc t v, I r o d cm 31 he; fle t jh cl s k 9 the switch 5 so that source 2 is. connected to: theioed After the shaft 7 has been rotatedffar'enoggh in o. clockwise direction to complete thei 0s ing ofthe switch 5, the limit switch 18 eratesto o en the above traced circuit of the motor? so as to stcp further clock fis rqtationofthe shaft 7. 1 ;I The swi h 5 remains closed mitilthe efiect the'energizaticn of the potential rel sy 10.- The energiaation of the potential rehj clock: a.

fund sour-Ce 1 is "again energized'so .asfto a to'cover all such changes and modifications tion as applied to a particular system and as embodying various devices diagrammatically indicated, changes and modlfications will be obvious to those skilled in the art and I, therefore, aim in the appended claims as fallwithinthe true spirit and scope of my I invention.

' What I claim as new and desire to secure by Letters Patent of the United States is:

a switch in each circuit, means including a reversible motor for closing one of said switches and opening the other of said switches when the armature of said motor rotates in one direction and for opening said one of said switches and closing said other of said switches when the armature of said motor rotates in the opposite direction, and means responsive to the voltages of said circuits for controlling the energization of said motor so that it develops a torque in a direction to cause the armature of said motor to rotate in one direction when one of said circuits is energized and the other circuit is deenergized and it develops a torque which causes the armature to rotate in the opposite direction when said one of said circuits is deenergized and the other c1rcu1t is energized.

2. In combination, two electric circuits, a switch in each circuit, means including a reversible motor for closing one of said switches and opening the other of said switches when p the armature of said motor rotates in one direction and for opening sald one of said switches and closing said other of said switches when the armature of said motor rotates 1n the opposite direction, and means responsive to the voltages of said circuits for controlling the energization of said motor so that when a certaln one of said circuits is energized and its respective switch is open the {motor develops a torque which causes the aruse 4 a-ndits respective switch is open the motor mature to ,rotate in a" direction to close the switchin said energized circuit and so that when 831d certain one of said circuits is de energized and the other c1rcu1t 1s energized develops a torque which causes the armature to rotate in a direction to close the switch in 7 said other circuit.

3. In combination, two, electric circuits, a switch in each circuit, means including a reversible motor for closing one of said switches and opening the other of said switches when the armature of said motor rotates in one direction and for opening said one of said ,switches and closing said other of said switches when thearmature of said motor rotates 1n the opposite direction, said motor having an armature winding and a field winding, means responsive to the voltage of one of said circuits "for connecting said windings across said one of said circuits so that saidmotor effects the closing of the switch; 10 z in said one of said circuits if it is open while' the voltage of said one of" said circuits is above a predetermined value,and means controlledby the voltagesof both circuits for connecting-said windings across the other of I" saidcircuits when said one of said circuits is deenergized and the other is energized so that the switch in said other circuit is closed.

4. In combination, two electric circuits, a switch in each circuit, means including a reversible motor for closing one of said switches and opening the other of said switches when the armature of said motor rotates in one direction and for opening said one of said switches and closing said other of said switches when the armature of said motor rotates in the opposite direction, said motor having an armature winding and a. field winding, means responsive to the voltage of one of said circuits for connecting said armature and field windings in series across said one of said circuits when the switch in said one of said circuits is open and the voltage of said one of said circuits is above a predetermined value for a predetermined time, and means controlled by said voltage responsive means and the voltage of the other of said circuits for connecting said armature and field windings in series across said other of said circuits when the switch in said other of said circuits is open and the voltage of said one of said circuits is below a predetermined value and the voltage of said other of said circuits is above a predetermined value.

direction and for opening said one of said 7110 switches and closing said other of said switches when the armature of said motor rotates in the opposite direction, and means responsive to the voltages of said circuits v y for selectively controlling the connection of said motor to said circuits so that said motor rotates in one direction when one of said circuits is energized and rotates in the opposite direction when said one of said circuits is deenergized and the other circuit is energized.

6. In combination, two electric circuits. a switch in each circuit, means including a reversible motor for closing one of said switches and opening the other of said switches when the armature of said motor rotates in one direction and for opening said one of said switches and closing said other of said switches when the armature of said motor rotates in the opposite direction, said motor 

